<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="icon" href="./favicon.ico"">
  <title>Sunshine</title>
</head>
<body>
  <div id="app"></div>
</body>
<script>
document.addEventListener('visibilitychange', function() {
  document.title = document.hidden ? '点我抽千万奖金':'Sunshine'
});
</script>
</html>